checking coils

[GreenTeam]

SO, I wound some really nice coils
AS best I can anyways.
And, there is one thing that is really bugging me
I am certain that I got anywhere from 99-101 turns per coil
But my issue is, by very first coil came out alot smaller than all the rest
that followed. And, I think it may be due to the fact that the wire im using
is not perfect, its been salvaged from hoverboard motors, They have I think
17 teeth and are 4.5" across. So, the enamelled wires, are pretty kinked
well not kinked, but not straight, and the straightening I have done is just
by stretching them as hard as I can as I unwound, ANd rewound unto a new coil bobbin. THan
they are wound by manual machine. SO, I get that they willl never be all the same size, but the size
differance from the first and the following ones is pretty large.
What I would like to know, besides tearing it apart and redoing it is, how do I test it with a digital multimeter
to see if they are all the same?

[Bruce S]

The short and quick answer is to set your meter to Ohms measure across the two leads on each coil.
Look for them to be as close to the same as possible.

Hope this helps
Bruce S

[hiker]

If your smaller coil is of less winds,,that will bring your voltage down across all of them,,I believe that’s what I heard years back when I built a few gens from used wire,,that and Any kinks in the wire will cause resistance,,

[GreenTeam]

If your smaller coil is of less winds,,that will bring your voltage down across all of them,,I believe that’s what I heard years back when I built a few gens from used wire,,that and Any kinks in the wire will cause resistance,,

Thank you! I did not know that

[GreenTeam]

I figured out why my one coil is a bit smaller even though its 100 turns also
I had some 0.4mm wire that is the same red color as my 0,5mm and somehow
I had used that lol. Another lesson learned

[SparWeb]

Yeah that'll do it.
Not interchangeable, either, so it looks like you have to wind another one!